There is a slim chance that he's just hiding somewhere, but I highly doubt it. He's been missing since early last night and he never misses a meal. I figure the cat got him, but I haven't given up hope yet.

:biggrin: Today when I came home from work, there he was swimming around like he'd never been missing. He looks absolutely fine. Little bugger had been hiding somewhere for 5 days. I had even looked in his favourite sleeping spot after lights out.
I don't know what that was all about? There is no aggression in this tank at all. Go figure!

Wrasses! Sheesh. Well, glad to hear anyhow.